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It turns out that new research shows that dull environments slow down or stop brain growth. It used to be thought that the brain doesn't grow new neurons, and we just have the ones we're born with. But that was shown by studying monkeys in caged environments. Some new research involved studying monkeys in natural environments with lots of toys and other stimulating things, and they grew more neurons. So the conclusion is something about not only being able to grow new neurons, but also that boring environments prevent the physical brain growth from happening.